1- Swipe left to view the Apps list
2- Tap Settings
3- Tap access point
Currently active settings will be marked as active
4- Press and hold the active setting until options menu appears
5- Tap View to view or Edit to edit settings
6- Note: Most likely you will only need to edit settings, if they are wrong. If you still want to create new settings then tap the plus sign and follows the steps below.
Tap Connection name
7- Enter a unique connection name
8- Tap Access point name
9- Enter internet
10- Tap MMS APN
11- Tap MMS access point name
12- Enter internet

US Cellular APN Internet Settings for Windows Phone 8, 8.1

APN

internet

Username

blank

Password

blank

Proxy server/URL

blank

Proxy port

80

US Cellular MMS Settings for Windows Phone8, 8.1

APN

internet

Username

blank

Password

blank

Authentication type

none

WAP gateway (URL)

blank

WAP gateway port

80

MMSC (URL)

http://mmsc1.uscc.net/mmsc/MMS

MMSC Port

blank

Maximum MMS size

1mb

IP type

IPv4

✉ Save the new APN, After making these settings go to access point main screen and set the newly added access points as active